EP3157201A1 - Procédé de traverse transparente temporisée destiné au transport de données dans des systèmes en temps réel répartis - Google Patents

Procédé de traverse transparente temporisée destiné au transport de données dans des systèmes en temps réel répartis Download PDF

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Publication number
EP3157201A1
EP3157201A1 EP16194135.6A EP16194135A EP3157201A1 EP 3157201 A1 EP3157201 A1 EP 3157201A1 EP 16194135 A EP16194135 A EP 16194135A EP 3157201 A1 EP3157201 A1 EP 3157201A1
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EP
European Patent Office
Prior art keywords
time
message
distribution unit
real
attributes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16194135.6A
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German (de)
English (en)
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EP3157201B8 (fr
EP3157201B1 (fr
Inventor
Stefan Poledna
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Tttech Computertechnik AG
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FTS Computertechnik GmbH
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Publication of EP3157201B1 publication Critical patent/EP3157201B1/fr
Publication of EP3157201B8 publication Critical patent/EP3157201B8/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/826—Involving periods of time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/407—Bus networks with decentralised control
    • H04L12/417—Bus networks with decentralised control with deterministic access, e.g. token passing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/78—Architectures of resource allocation
    • H04L47/781—Centralised allocation of resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/80—Actions related to the user profile or the type of traffic
    • H04L47/801—Real time traffic

Definitions

  • the invention relates to a method for the periodic transport of real-time data in a distributed computer system comprising computer system node computers, in particular a plurality of node computers, and distribution units, in particular a plurality of distribution units, wherein the node computers and the distribution units have access to a global time, and wherein real-time data is transported by means of timed real-time messages, wherein timed real-time messages are transported in the distribution units in periodic time slots.
  • the invention further relates to a computer system, in particular a distributed real-time computer system, for the periodic transport of real-time data
  • the computer system comprises node computers, in particular a plurality of node computers, and distribution units, in particular a plurality of distribution units, wherein the node computers and the distribution units have access to a global Have time, and wherein real-time data is transported by means of time-controlled real-time messages, wherein time-controlled real-time messages are transported in the distribution units in periodic time slots.
  • a repeating periodic process section is referred to as a frame.
  • a frame begins with the synchronized observation of a technical process by, for example, spatially distributed sensors to detect the state of this technical process at a given time.
  • Each sensor is preferably assigned a node computer, wherein sensor and node computers can be designed as separate units and connected to each other, or sensor and node computers are designed as a structural unit ("intelligent sensor").
  • the internal clock synchronization contained in the time-controlled TT-Ethernet protocol [2] can be used to set up a global time in all components of a distributed real-time system, in particular a distributed real-time computer system. Since it is possible to set the internal Ethernet time with an external time standard, e.g. GPS, the Ethernet time can also take over the synchronization of the sensors, if an external synchronization is required.
  • an external time standard e.g. GPS
  • the node computers or the intelligent sensors arranged at the sensors or the sensors perform a first preprocessing of the sensor data and send these preprocessed sensor data, preferably in a periodically recurring time slot, in the form of real-time messages to a control center via a real-time communication system.
  • the evaluation of the incoming sensor data in the control center makes it possible to record the current state of the observed technical process and to specify (new) setpoint values for existing actuators.
  • the duration of a frame is determined by the sum of the transport times of the real-time messages and the processing times of the real-time data.
  • a real-time message is a message that contains real-time data and that is to arrive at a receiver within a specified time interval (real-time interval).
  • the store and forward method an incoming message is cached in a distribution unit as a whole before it is forwarded by the distribution unit towards its destination.
  • the cut-through method after evaluation of the first part of the message in the distribution unit, the message header, which contains the attributes of the message, such as message type, destination address and sender address, is used. already started forwarding the message towards its destination before the entire message has arrived in the distribution unit.
  • the cut-through method therefore has a shorter pass -through interval of the message in a dispatch unit than the store-and-wait method.
  • This object is achieved by a method and a computer system mentioned in the introduction by assigning attributes of time-controlled real-time messages a priori to those periodic time slots of a distributor unit in which periodic time slots these time-controlled real-time messages are to be transported through the distributor unit, and preferably in the distributor unit and wherein the attributes assigned to a periodic time slot indicate to the output port or output ports of the distribution unit to which a timed real time night arriving in the distribution unit in the distribution unit is to be forwarded in the distribution unit, and one in a periodic time slot incoming message in the distribution unit after the beginning of the arrival of the message in the distribution unit, in particular immediately after the beginning of the arrival, namely immediately after the arrival of the beginning of a header of the incoming message to which the output port (s) specified in the attributes assigned to the periodic time slot are forwarded to the distribution unit.
  • the object can be achieved with a distribution unit which is set up to implement the measures described above.
  • a modified time-controlled cut-through method is introduced.
  • attributes such as the destination address are assigned to a time-controlled real-time message a priori to the periodic time slot, in which time slot the periodic time-controlled real-time message will be transported by a distribution unit.
  • the distribution unit can assume that the incoming message in a periodic time slot is the real-time message that the for Having this periodic time slot having attributes.
  • the term "immediately after the arrival of the beginning of a header of the incoming message” is to be understood that in any case, even before the header is completely arrived, the incoming message is forwarded, at least with the forwarding is already started.
  • this is preferably to be understood as meaning that, within the scope of the technical possibilities, the forwarding takes place as soon as possible after the beginning of the header, or the forwarding is started.
  • the message In the time interval between the start of sending a message from a node computer or a distribution unit and the end of sending this message, the message is referred to as expiring message related to this node computer or this distribution unit.
  • the message In the time interval between the start of receiving a message at a node computer or a distribution unit and the end of receiving this message, the message is referred to as incoming / incoming message related to this node computer or this distribution unit.
  • FIG. 1 shows a simple computer system or computer network, in particular a distributed real-time computer system, with four node computers 100,101,102,103 and two distribution units 121,122.
  • a data line 115 connects the node computer 100 to the distribution unit 122
  • a data line 111 connects the node computer 101 to the distribution unit 122
  • a data line 112 connects the node computer 102 to the distribution unit 121
  • a data line 113 connects the node computer 103 to the distribution unit 121
  • a Data line 114 connects distribution unit 121 to distribution unit 122.
  • FIG. 2 shows the format of a typical network message, such as in TT Ethernet [2] .
  • the start is followed by delimiter 202, the destination address 203, the start address 204, and a control field 205 which can indicate the length of the message.
  • Fields 201, 202, 203 204, 205 are referred to as header 210 of the message.
  • the payload 206 is the range of user data. If there are only a few bytes of user data, then the message must be stretched to a minimum length using field 207 .
  • the frame check sequence 208 At the end of the message.
  • Fields 103, 104, 105 contain the attributes of the message. These attributes are preferably included in header 110 of the message.
  • the first 20 bytes of a message must be awaited in the known cut-through method after arrival of the beginning of the message in a distribution unit, before it can be decided to which output port of the distribution unit the message must be forwarded.
  • real-time data is now transmitted by means of timed real-time messages in the computer system. If a particular distribution unit is considered, it is provided that a specific time-controlled real-time message is transported in a specific time slot by this distribution unit. According to the invention, therefore, the attributes of such a real-time message are stored a priori in the distribution unit and assigned to the periodic time slot to which this real-time message in this distribution unit is expected.
  • this message is forwarded to the output port or output ports of the distribution unit, without caching, and without having to wait for the attributes to be read from the incoming real-time message.
  • the distribution unit checks during transmission whether the attributes contained in the header of the message passing through the distribution unit are associated with the a priori in the Distributor unit stored attributes of the expected timed real-time message and, if not, the distribution unit aborts the current message transport of the message in progress. Thus, since the recipient of a canceled message does not receive a correct frame check sequence 108, it will discard that message.
  • the node computer 102 sends a time-controlled real-time message before the time slot, which is provided a priori for this timed real-time message in the distribution unit 121 , to the distribution unit 121 .
  • the distribution unit 121 will cache the timed real-time message until the time slot provided for this timed real-time message begins.
  • FIG. 1 can also occur the case that, for example, the node computer 102, a timed real-time message and at the same time the node computer 103 to send a store-and-forward message via the distribution units 121 and 122 to the node computer 100 .
  • the distribution unit 121 or the distribution unit 122 it is preferably determined that a distribution unit allocates a time slot which is suitable for a specific timed real-time message is provided, by no other message may prove.
  • the present invention results in a significant reduction of Data transfer time.
  • the associated significant improvement in control engineering is of great economic importance.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
EP16194135.6A 2015-10-16 2016-10-17 Procédé de traverse transparente temporisée destiné au transport de données dans des systèmes en temps réel répartis Active EP3157201B8 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT508832015 2015-10-16

Publications (3)

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EP3157201A1 true EP3157201A1 (fr) 2017-04-19
EP3157201B1 EP3157201B1 (fr) 2018-08-22
EP3157201B8 EP3157201B8 (fr) 2018-10-17

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US (1) US10243880B2 (fr)
EP (1) EP3157201B8 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018215293A1 (fr) * 2017-05-24 2018-11-29 Wago Verwaltungsgesellschaft Mbh Préchargement d'instructions
WO2020239287A1 (fr) * 2019-05-28 2020-12-03 Beckhoff Automation Gmbh Procédé de transmission de données, structure de données, réseau d'automatisation et dispositif de déverrouillage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017063016A1 (fr) 2015-10-16 2017-04-20 Fts Computertechnik Gmbh Procédé et système informatique permettant une transmission rapide de messages en temps réel à commande temporelle

Citations (4)

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EP1686744A1 (fr) * 2005-01-31 2006-08-02 Samsung Electronics Co., Ltd. Procédé d'allocation d'une période de temps sur un canal pour la communication point à point entre dispositifs communiquant à travers un bus série universel sans fil et procédé de communication point-à-point correspondant
EP2221209A1 (fr) * 2007-12-13 2010-08-25 Mitsubishi Electric Corporation Système de communication, dispositif de communication et dispositif de relais pour train
US20100254392A1 (en) * 2009-04-01 2010-10-07 Srinivas Katar Managing transmissions among nodes communicating over a shared communication medium
US20110026411A1 (en) * 2009-07-29 2011-02-03 Lijing Hao Methods and systems for fail-safe communication

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US7215637B1 (en) * 2000-04-17 2007-05-08 Juniper Networks, Inc. Systems and methods for processing packets
EP1451981A1 (fr) * 2001-10-29 2004-09-01 MPNET International, Inc. Procede, systeme, et structure de donnees pour des communications multimedia
ATE313195T1 (de) * 2002-04-16 2005-12-15 Bosch Gmbh Robert Verfahren zum synchronisieren von uhren in einem verteilten kommunikationssystem
CN101253781A (zh) * 2005-09-01 2008-08-27 最优创新公司 媒体访问控制架构
WO2010057198A1 (fr) * 2008-11-17 2010-05-20 Starent Networks, Corp Equilibrage de charge dynamique dans un reseau de communication
PL2399368T3 (pl) * 2009-02-20 2013-12-31 Thomson Licensing Synchronizowana czasowo rezerwacja zasobów w sieciach z komutacją pakietów
US9749241B2 (en) * 2010-11-09 2017-08-29 International Business Machines Corporation Dynamic traffic management in a data center
GB2532053A (en) * 2014-11-07 2016-05-11 Ibm NC-SI port controller

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
EP1686744A1 (fr) * 2005-01-31 2006-08-02 Samsung Electronics Co., Ltd. Procédé d'allocation d'une période de temps sur un canal pour la communication point à point entre dispositifs communiquant à travers un bus série universel sans fil et procédé de communication point-à-point correspondant
EP2221209A1 (fr) * 2007-12-13 2010-08-25 Mitsubishi Electric Corporation Système de communication, dispositif de communication et dispositif de relais pour train
US20100254392A1 (en) * 2009-04-01 2010-10-07 Srinivas Katar Managing transmissions among nodes communicating over a shared communication medium
US20110026411A1 (en) * 2009-07-29 2011-02-03 Lijing Hao Methods and systems for fail-safe communication

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018215293A1 (fr) * 2017-05-24 2018-11-29 Wago Verwaltungsgesellschaft Mbh Préchargement d'instructions
US11080061B2 (en) 2017-05-24 2021-08-03 Wago Verwaltungsgesellschaft Mbh Pre-loading of instructions
EP3907947A1 (fr) * 2017-05-24 2021-11-10 Wago Verwaltungsgesellschaft mbH Précharge d'instructions
WO2020239287A1 (fr) * 2019-05-28 2020-12-03 Beckhoff Automation Gmbh Procédé de transmission de données, structure de données, réseau d'automatisation et dispositif de déverrouillage
US11539549B2 (en) 2019-05-28 2022-12-27 Beckhoff Automation Gmbh Data transmission method, data structure, automation network and unlocker

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EP3157201B8 (fr) 2018-10-17
US20170111293A1 (en) 2017-04-20
EP3157201B1 (fr) 2018-08-22
US10243880B2 (en) 2019-03-26

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